35 The dose rate in EE for the electronics is roughly 10 times that of EB Electronics out to η=2.6 where dose is 150KGy EE electronics behind a moderator Current electronics is meant to be used in both EE and EB Hence a priori we expect no problems for EB electronics at SLHC luminosities EE doses will enter a new realm at SLHC Need to understand performance of components at this level Activation of EE electronics is also an issue if we wanted to consider servicing electronics periodically Expected Dose rates CMS ECAL : Integrated Luminosity of 2500 pb -1 At η=0 EB, fluence 7x10 13 n/cm 2 At η=1.5 EB, fluence 1.4x10 14 n/cm 2 At η=2.6 EE fluence 5x10 14 n/cm 2 13 mai 2004 Ph. BUSSON LLR Ecole polytechnique, Palaiseau 35

36 Pulse shape in the ECAL: Data The Pulse shape from the MGPA is relatively wide compared with the bunch crossing time at both LHC/SLHC (40nsec) Sampling at 40MHz gives good energy and time resolution regardless of the phase of the beam with respect to sampling Extracting the energy from either odd/even pulse trains should not be a problem if we know which contains the event of interest The samples are shipped off detector where this information is available Pileup can be a problem at high eta, but can be combated with appropriate choice of weights Trade off timing resolution (pileup rejection) versus energy resolution 13 mai 2004 Ph. BUSSON LLR Ecole polytechnique, Palaiseau 36

37 ECAL and the trigger The ECAL data forms one of the main inputs to the L1 calorimeter trigger Energy information is provided at 40 MhZ to the TCC which in turn provides input to the calorimeter L1 trigger Trigger primitives are generated in the FENIX chips located on the FE card Strips of 5 crystals are summed These are then summed into trigger towers These chips are now in production No way to change now Some handles were placed in the chip to deal with SLHC running 13 mai 2004 Ph. BUSSON LLR Ecole polytechnique, Palaiseau 37

38 Samples used vs clock phase The variation of the pulse shape between odd/even bunches is slow enough that there should be little degradation to the trigger by using the wrong weights on some of the strips. Detailed studies will need to be done to see how to optimize the filters and strategies for the best trigger performance at SLHC There are options in the FENIX which allow different strategies 13 mai 2004 Ph. BUSSON LLR Ecole polytechnique, Palaiseau 38

39 Conclusions The ECAL electronics in EB should in principle be able to cope with the SLHC without replacement as it is currently implemented The ECAL electronics in EE is more uncertain, the main risk being the low voltage regulators R & D on voltage regulation schemes needed The trigger primitive generation has some flexibility built in to the current system to handle double the number of bunches Will require study to determine optimal utilization 13 mai 2004 Ph. BUSSON LLR Ecole polytechnique, Palaiseau 39

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